How to Properly Flash a Window

Last summer we hired a new crew member. When it came time to hang windows, I clamped a GoPro to the fascia and recorded the installation. This can be used as a reference for new crew members, but it can also be used to show potential clients our methods.

We have used Huber Engineered Wood Zip System for 11 years and now. One major reason we like this system is the simplicity of flashing openings and penetrations. Managing bulk water is very important for the longevity of the structure, but it also lowers our risk. Thanks to ZIP System for sponsoring this video.

[billglaser]

From a glazier to a framer, we’ll done! Exactly how I do flashing and install.

[JamesSavage-lp]

Can't fail with this video. I always wondered why it was so drafty near the windows. 😊

[louied]

Thanks for sharing such a simple and effective way. I watched some other videos and they tape the entire opening then caulk and install window then retake with sill open. 🤷🏻‍♂️🤦‍♂️ such a waste of money for the same air and water tight results.

[johnwhite]

I like that awesome is looking creatively at balancing costs time quality and endurance. I think many windows we see on utube are over flashed- of course if you are spending 1, 000mplus on some houses/sites (you know who I’m talking about) spending $60 on materials let insuppose makes sense .

[davidhastings]

Nice job guys! That's a proper way to install a window and I've been installing new construction and replacement windows for over 40 years! Nice tight seal!

[Mrjohndoe]

The corner tape should go in first, then the tape covering the sill on top if it. I understand that there is still tape going over that, but it's best practice to cover all your tape edges unless they are adhering to the wall or framing

[bellm]

How do you caulk/foam/insulate the window on the inside after you have it set like in this video?

[jamesdean]

Thanks I have seen so many not do this step.

[doneown]

always , always, always !, thanks, that will stick with me now !😮, excellent footage on How To

[gpjadams]

Thanks for showing me that little batwing trick in the corner. I'm going to remember that one.

[AnthonyAttard-ixcb]

But did you caulk the bottom of the nailing flange?? I know you definitely caulk sides and top with continuous solid bead… also if it’s a no flange window would you caulk the bottom?? I thought it was a no caulk on bottom to allow for drainage, but so many conflicting videos by so called experts…

[avwholesomegamer]

Shane, you’re supposed to laugh at the bosses’ jokes, buddy 😅

[janonymous-ujvx]

Corner tape should be installed prior to flashing the sill

[ArthurDentZaphodBeeb]

Nice, low-cost, quick-to-install flashing detail. I presume you use sealant/backer rod for interior air sealing? If so, what sealant do you use? Do you slope your sills 5 degrees or don't you find that necessary?

[Mattnoble]

So a couple bought my grandparents home and they want to seal the windows. The house is over 100 years old and I have been helping them restore it, that will be key when we get around to that

[wilkinsoncarpentry]

How lucky is Shane getting taught off of you guys

[michelleosborne]

We bought a house and didn't realize that it wasn't wrapped or flashed until the floor near a window seemed wet. Is there a way to remedy this without removing tearing vinyl siding?

[ronnieross]

Wow! Am I over flashing zip wall systems? this is exactrly how I flash regular typar homes, but on zip systems I was taught to flash the entire opening. Top, sides, and bottom, and bring the tape from the outside all the way flush to the inside. Tons of zip tape(which isn't cheap).

[bigneilh]

How is the sill sealed to the framing? You’re not taping the bottom nailfin. Are you caulking the back of the bottom nailfin when you do the others? Thanks for the info!

[joshuasmith]

I'm trying to learn how to do this so I have a couple questions if you don't mind answering them. You first put the flashing tape on the sill and up the sides, then you followed with flex tape on those bottom corners. Why not put the flex tape in those corners then put the tape over that on the sill/sides? Seems like that would be the better way to shed water if it got in and ran down the sides. My second question is why not tape all the way up the sides and the top of the opening? Wouldn't that be a good idea to prevent any air that gets behind the window from making its way into the house? I know that some people don't put sealant on the bottom flange of the window so that any water that gets in can escape (not sure if you did that here or not) but if you did and the window has a great seal to the sheathing then I guess I can see why you wouldn't need to run tape all the way up the sides and across the top.